ConcurrentDictionary<TKey, TValue> 类
【表示可由多个线程同时访问的键/值对的线程安全集合。】
支持 .NET Framework 4.0 及以上。
示例代码:
class CD_Ctor { // Demonstrates: // ConcurrentDictionary<TKey, TValue> ctor(concurrencyLevel, initialCapacity) // ConcurrentDictionary<TKey, TValue>[TKey] static void Main() { // We know how many items we want to insert into the ConcurrentDictionary. // So set the initial capacity to some prime number above that, to ensure that // the ConcurrentDictionary does not need to be resized while initializing it. int NUMITEMS = 64; int initialCapacity = 101; // The higher the concurrencyLevel, the higher the theoretical number of operations // that could be performed concurrently on the ConcurrentDictionary. However, global // operations like resizing the dictionary take longer as the concurrencyLevel rises. // For the purposes of this example, we'll compromise at numCores * 2. int numProcs = Environment.ProcessorCount; int concurrencyLevel = numProcs * 2; // Construct the dictionary with the desired concurrencyLevel and initialCapacity ConcurrentDictionary<int, int> cd = new ConcurrentDictionary<int, int>(concurrencyLevel, initialCapacity); // Initialize the dictionary for (int i = 0; i < NUMITEMS; i++) cd[i] = i * i; Console.WriteLine("The square of 23 is {0} (should be {1})", cd[23], 23 * 23); } }
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